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Question

我是新手，所以当我为了学习它而愚弄时，我发现了一些非常有趣的东西。在我的appDelegate中：

func application(application: UIApplication, didFinishLaunchingWithOptions launchOptions: [NSObject: AnyObject]?) -> Bool {
    let directory: NSURL = NSFileManager.defaultManager().containerURLForSecurityApplicationGroupIdentifier("group.Hobo.RealmDatabase")!
    var config = Realm.Configuration()
    config.fileURL = directory.filePathURL?.URLByAppendingPathComponent("db.realm")
    Realm.Configuration.defaultConfiguration = config
    let realm = try! Realm()
    print("File Location: \(realm.configuration.fileURL!)") // -> Location A
    print("NO OF USERS: \(realm.objects(User).count)") // -> 0
    return true
}

但在我的ViewController中：

 let realm = try! Realm()

 override func viewDidLoad() {
    super.viewDidLoad()

    print("NO OF USERS IN VIEWDIDLOAD: \(realm.objects(User).count)") // -> 1

    let firstTime = loadFirstTime()
    if firstTime {
        // configure USER!
        let user = User()
        user.monthlyIncome = 50000
        try! realm.write({
            realm.add(user)
        })
        saveFirstTime(false)
        print("First time, user written")
    }
    dailyLimit.text = String(realm.objects(User).first!.dailyLimit)

}

注意print（）函数的返回值。在app delegate中，print的结果（用户数:)返回0，但是在viewController的viewDidLoad中，它返回了1。

两者都不应该返回相同的值吗？在这种情况下1？

提前致谢!!

Answer 1

是的，它是一样的，我猜你错误地删除了用户，在应用程序加载时，或类似的东西，你应该使用“Realm浏览器”检查你的数据库状态，这样你就可以看到一个对象运行时更改。 https://github.com/realm/realm-browser-osx

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检查您是否访问默认配置。在这个领域，你可以有多种配置：

let config = Realm.Configuration(
    // Get the URL to the bundled file
    fileURL: NSBundle.mainBundle().URLForResource("MyBundledData", withExtension: "realm"),
    // Open the file in read-only mode as application bundles are not writeable
    readOnly: true)

// Open the Realm with the configuration
let realm = try! Realm(configuration: config)

Answer 2

取决于领域3

的文档

https://realm.io/docs/swift/latest/#realm-configuration

func setDefaultRealmForUser(username: String) {
        var config = Realm.Configuration()

        // Use the default directory, but replace the filename with the username
        config.fileURL = config.fileURL!.deletingLastPathComponent().appendingPathComponent("\(username).realm")

        // Set this as the configuration used for the default Realm
        Realm.Configuration.defaultConfiguration = config
    }

领域设置自定义fileURL混淆

2 个答案:

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